import java.util.Scanner;

public class demo009 {
    public static void main(String[] args){
        Scanner scan=new Scanner(System.in);
        System.out.println("请输入一个字母");
        String a=scan.next();
        switch (a){
            case "a":
            case "e":
            case "i":
            case "o":
            case "u":
                System.out.println("是");
                break;
            default:
                System.out.println("不是");
        }
    }
}
